<!-- tabSelected 子组件抛出事件tabSelected，父组件执行这个自定义事件，（tabSelected）="父组件事件处理" -->
<app-scroll-tap 
[menus]="menus$ | async" 
[backGroundColor]="scrollBackGroundColor" 
(tabSelected)="handleTabSelected($event)"
[selectedTabLink]="selectedTabLink$ | async"
>
<!-- <div>hello 嵌套投影</div> -->
</app-scroll-tap>
{{scrollTop}}
<div #container class="main" (scroll)="scroll()">
    <router-outlet></router-outlet>
</div>
